News Details
Epoxy resin low temperature rapid coating crosslinking agent
2017-7-25 16:02:05
Epoxy resin low temperature rapid coating crosslinking agent
Using phenol, polyformaldehyde, diethylene triamine and thiourea as monomer, and DMP - 30 as promoter, the low temperature rapid crosslinking agent of epoxy resin was synthesized.
Analyses the reaction temperature, reaction time and dosage of various materials on the properties of epoxy resin, crosslinking agent, and further investigates the epoxy crosslinking agent rapid low temperature and dosage of epoxy resin is the best. Reaction under (110 + 2) ℃ 2.5 h, phenol, paraformaldehyde, divinyl three amine, the ratio of thiourea is 1:1.25:1.3, 1.1, and the amount of DMP - 30 accelerator was 5%, with 30% of the amount evenly mixed with epoxy resin, and when - 5 ℃ can fast crosslinked 20 min.
Epoxy resin (EP) is a kind of important high molecular compound with excellent mechanical, electrical and heat-resistant properties.
At room temperature and heating crosslinking agent can meet the requirements of most situations, but in the field of low temperature quick crosslinking, now in the market for more fatty amine, and the synthesis of thiourea products or low molecular thiol compounds, they have great advantages in rapid repair and winter, but there are also some disadvantages, with aliphatic amine and thiourea synthesized cross-linking agent crosslinked EP brittleness is big, poor mechanical properties, low bond strength, temperature resistance is poor.
Low molecular sulphide has a high odor and temperature tolerance, which is suitable for quick leakage and temporary emergency. With the rapid development of science and technology in China, the annual usage of EP has reached nearly a million tons, and the associated crosslinking agent has been developed and used continuously. EP low temperature quick crosslinking agent, in particular, its application scope is more and more widely, in car maintenance, mechanical processing, construction, water conservancy engineering, bridge construction and other industries have a very important role, can greatly save time, improve the construction progress, achieve the goal of fast construction, bonding and repair.
The author choose phenol, paraformaldehyde, divinyl three amine, thiourea condensation reaction of DMP - 30 as the promoter, developed a highly active, good performance, low temperature fast crosslinked epoxy resins under the low temperature quick crosslinking agent.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Using phenol, polyformaldehyde, diethylene triamine and thiourea as monomer, and DMP - 30 as promoter, the low temperature rapid crosslinking agent of epoxy resin was synthesized.
Analyses the reaction temperature, reaction time and dosage of various materials on the properties of epoxy resin, crosslinking agent, and further investigates the epoxy crosslinking agent rapid low temperature and dosage of epoxy resin is the best. Reaction under (110 + 2) ℃ 2.5 h, phenol, paraformaldehyde, divinyl three amine, the ratio of thiourea is 1:1.25:1.3, 1.1, and the amount of DMP - 30 accelerator was 5%, with 30% of the amount evenly mixed with epoxy resin, and when - 5 ℃ can fast crosslinked 20 min.
Epoxy resin (EP) is a kind of important high molecular compound with excellent mechanical, electrical and heat-resistant properties.
At room temperature and heating crosslinking agent can meet the requirements of most situations, but in the field of low temperature quick crosslinking, now in the market for more fatty amine, and the synthesis of thiourea products or low molecular thiol compounds, they have great advantages in rapid repair and winter, but there are also some disadvantages, with aliphatic amine and thiourea synthesized cross-linking agent crosslinked EP brittleness is big, poor mechanical properties, low bond strength, temperature resistance is poor.
Low molecular sulphide has a high odor and temperature tolerance, which is suitable for quick leakage and temporary emergency. With the rapid development of science and technology in China, the annual usage of EP has reached nearly a million tons, and the associated crosslinking agent has been developed and used continuously. EP low temperature quick crosslinking agent, in particular, its application scope is more and more widely, in car maintenance, mechanical processing, construction, water conservancy engineering, bridge construction and other industries have a very important role, can greatly save time, improve the construction progress, achieve the goal of fast construction, bonding and repair.
The author choose phenol, paraformaldehyde, divinyl three amine, thiourea condensation reaction of DMP - 30 as the promoter, developed a highly active, good performance, low temperature fast crosslinked epoxy resins under the low temperature quick crosslinking agent.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
The effects of low temperature rapid crosslinking agent raw material ratio, synthesis temperature, synthesis time and DMP - 30 addition on the initial setting time, crosslinking time and mechanical properties of EP crosslinking system were discussed in detail. In a cold environment, commonly used fatty amine as crosslinking agent, the cross-linking of the EP process, the active groups in a state of being "frozen", EP cross-linking incomplete, crosslinking soft, low strength, poor resistance to chemicals.
Based on low molecular activity of fatty amine crosslinking agent at room temperature can be quickly crosslinking mechanism of EP, to make low molecular aliphatic amine at low temperatures also can keep high activity, must introduce more in fatty amine groups can react with EP.
In the molecular structure of crosslinking agent developed, we introduce phenolic and lipid ring chains to improve the heat resistance and toughness of crosslinking. The low temperature active groups of phenol hydroxyl group, CS group and NH group were introduced, and the low temperature reaction activity of crosslinking agent was improved. Join the DMP - 30 in the crosslinking agent, the crosslinking agent activity to further improve, especially suitable for low temperature situations, can fast crosslinked under - 5 ℃ environment EP.
In the study, the author also used polyparaformaldehyde to replace 37% formaldehyde solution, which greatly reduced the environmental pollution caused by waste water. Raw materials. Phenol: industrial products; Polyformaldehyde: industrial products; Diethylenetriamine: pure analysis; Thiourea: industrial products; DMP - 30 accelerator: industrial products; E-51 epoxy resin: industrial products; Reactive diluent 501: industrial products.
Instruments and equipment. Rotational viscometer: NDJ - 8S type; Universal testing machine: WES - 20; Electric mixer: JB50 - D type;
Electric heating sleeve: hdm-2000c, Shanghai sodome-test equipment co. LTD. 1.3 performance test EP's viscosity was measured in GB/T12007.4 -- 1989; The tensile shear strength is tested by gb7124-2008. EP gel time was tested by GB/T12007.7-1989.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The effects of low temperature rapid crosslinking agent raw material ratio, synthesis temperature, synthesis time and DMP - 30 addition on the initial setting time, crosslinking time and mechanical properties of EP crosslinking system were discussed in detail. In a cold environment, commonly used fatty amine as crosslinking agent, the cross-linking of the EP process, the active groups in a state of being "frozen", EP cross-linking incomplete, crosslinking soft, low strength, poor resistance to chemicals.
Based on low molecular activity of fatty amine crosslinking agent at room temperature can be quickly crosslinking mechanism of EP, to make low molecular aliphatic amine at low temperatures also can keep high activity, must introduce more in fatty amine groups can react with EP.
In the molecular structure of crosslinking agent developed, we introduce phenolic and lipid ring chains to improve the heat resistance and toughness of crosslinking. The low temperature active groups of phenol hydroxyl group, CS group and NH group were introduced, and the low temperature reaction activity of crosslinking agent was improved. Join the DMP - 30 in the crosslinking agent, the crosslinking agent activity to further improve, especially suitable for low temperature situations, can fast crosslinked under - 5 ℃ environment EP.
In the study, the author also used polyparaformaldehyde to replace 37% formaldehyde solution, which greatly reduced the environmental pollution caused by waste water. Raw materials. Phenol: industrial products; Polyformaldehyde: industrial products; Diethylenetriamine: pure analysis; Thiourea: industrial products; DMP - 30 accelerator: industrial products; E-51 epoxy resin: industrial products; Reactive diluent 501: industrial products.
Instruments and equipment. Rotational viscometer: NDJ - 8S type; Universal testing machine: WES - 20; Electric mixer: JB50 - D type;
Electric heating sleeve: hdm-2000c, Shanghai sodome-test equipment co. LTD. 1.3 performance test EP's viscosity was measured in GB/T12007.4 -- 1989; The tensile shear strength is tested by gb7124-2008. EP gel time was tested by GB/T12007.7-1989.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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